What does the word “haven” in the last paragraph refer to?

shelter
语义题。根据题干定位至原文最后一段。该段前两句说到：You can imagine the sibling rivalry in all its permutations. Eventually I took haven in the written word to get away from it.从第一句的rivalry一词可以看出作者与弟弟妹妹间的竞争，而第二句的to get away from it说明了作者读书的目的就是为了逃避这种竞争。由此便可推知shelter“避难所”是正确答案。